package com.github;

import java.util.ArrayList;
import java.util.List;
import java.util.TreeSet;

/**
 * Description:
 *
 * @author zwl
 * @version 1.0
 * @date 2021/8/13 上午8:01
 */
public class Test3 {

    public static void main(String[] args) {

        //List<Integer> list = new ArrayList<>(5);
        //
        //Object[] objects = list.toArray();
        //
        //System.out.println(objects.length);
        //
        //list.add(11);
        //list.add(12);
        //
        //Object[] objects1 = list.toArray();
        //
        //System.out.println(objects1.length);

        TreeSet<Integer> treeSet = new TreeSet<>();

        treeSet.add(null);
    }
}
